Fluke 225C User Manual - Page 87

Profibus DP/RS-485, Profibus DP Measurement Connections

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Profibus DP/RS-485 Default probe setting 10:1. Use the Fluke 10:1 probes. 1 Connect the red probe to the test tool input A and the grey probe to input B. 2 Connect the ground lead of the input A probe to the DP bus RxD/TxD N (-) 3 Connect the ground lead of the input B probe to the DP bus cable shield. 4 Connect the probe tip of both probes to the DP bus RxD/TxD P (+) DATA + DATA DATA GND 6 Using The Bushealth Function Input Connections and Tested Signals Table 9. Profibus DP Tested Signal Properties Signal Description V-Offset V-Level Data Rise Fall Jitter Signal Dist. Overshoot V offset Peak-peak voltage Bit width Rise time as % of bit width Fall time as % of bit width Jitter distortion Signal distortion (Manchester decoding, default setting) Overshoot (NRZ decoding, can be selected via limit setup) Note The bus normally has continuous data traffic. Figure 43. Profibus DP Measurement Connections 77

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Using The Bushealth Function
Input Connections and Tested Signals
6
77
Profibus DP/RS-485
Default probe setting 10:1. Use the Fluke 10:1 probes.
1
Connect the red probe to the test tool input A
and the grey probe to input B.
2
Connect the ground lead of the input A probe to
the DP bus RxD/TxD N (-)
3
Connect the ground lead of the input B probe to
the DP bus cable shield.
4
Connect the probe tip of both probes to the DP
bus RxD/TxD P (+)
DATA +
DATA -
DATA GND
Figure 43. Profibus DP Measurement Connections
Table 9. Profibus DP Tested Signal Properties
Signal
Description
V-Offset
V offset
V-Level
Peak-peak voltage
Data
Bit width
Rise
Rise time as % of bit width
Fall
Fall time as % of bit width
Jitter
Jitter distortion
Signal Dist.
Overshoot
Signal distortion (Manchester
decoding, default setting)
Overshoot (NRZ decoding, can be
selected via limit setup)
Note
The bus normally has continuous data traffic.